tune AC38

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  • Bottom bracket at its very best
    • The bottom bracket that withstands the legs of the strongest sprinters
    • Wide experience with light weight bottom brackets for many years
    • Multiple product protection. That’s what we call the leading edge.
    • Wide range of spindle lengths, materials and bearing types
    • 8-times sealed (even on the inside!) for ultra-long lasting design – pressure washer resistant!
    • Superstiff, superlight
    • Maximum bearing spacing
    • Easy installation
    • Best fit, no creaking
    • Adjustable chain line (on request only)
    • Location - non-location bearing application – no misalignment possible
    • Easy and inexpensive exchange of cartridge bearings
    • The bottom bracket for life!

    Production methodCNC-lathed cups, spindle, bolts
    MaterialCups made from Aluminium 7075 T6
    Axle made from steel (AC37) or Titanium TiAl6V4 (AC38)
    Bolts made from Titanium TiAl6V4
    Square taperJIS (Japan Industry Standard):
    cross section: 12,65 mm; Angle: 2°, special version (only 111 mm spindle) as per ISO-Standard (International Standardisation Organization) for Campagnolo cranks. 104 mm spindle fits for Campagnolo since ‘95 with JIS dimensions
    Threads of cupsBSA 1.37" x 24
    ITA 36 x 24
    Installationwith pin tool (makeshift), better with tune W2 tool
    Chainlinefixed chain line
    Bearings3 single-row radial cartridge ball bearings:
    2 x 61903 2RS
    1 x 61803 2RS
    Sealing8 times - 2 labyrinth-sealings + 2 lips per cartridge bearing + Aluminium shell
    Crank fixationvia 2 separate Titanium elongation bolts with 8 mm socket head for more spindle stiffness – compared to the usual, short crank bolts – and less notches on the bolts (higher bolt strength).
    Weight w/out boltsAC38 - 104 mm: 145 g; 113 mm: 158 g
    AC37 - 104 mm: 196 g; 113 mm: 206 g
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